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Problem 1. (10 points) Show that any linear combination of 關 and 上 salo alinear combination
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Problem 2. (10 poimts) Let A be asquare matrix sittme that (A一3D(A+21D =
orA=-2D Why?
Problem 3. (10 points) Suppose A, B, Care invertible matrices and XX amatrix such that A ~ BXC.
Prove that Xis invertible-